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This paper presents a highly integrated solid-state modulator designed to drive high-power klystrons in linear accelerators. The modulator employs a vertically integrated architecture in which the solid-state module array is directly combined with the high-voltage pulse transformer. This configuration eliminates long high-voltage cable connections, reduces parasitic inductance, and improves compactness and maintainability. The proposed modulator has been experimentally validated in high-power tests with an 80 MW S-band klystron at the Hefei Advanced Light Facility (HALF), achieving the required pulse waveform quality and stability. In addition, with limited modification, the same architecture can be adapted to higher repetition-rate applications such as the Super Tau-Charm Facility (STCF) injector, demonstrating its scalability for future large-scale accelerator facilities.
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